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Tire tread comprising blocks with stepped sidewalls

a technology of sidewalls and blocks, applied in the field of tire treads, can solve the problems of uneven wear of blocks in patterns, stone trapping, and even greater likelihood of damage, and achieve the effects of reducing the possibility of a tear, reducing the possibility of tearing, and reducing the likelihood of tearing

Active Publication Date: 2013-02-05
PIRELLI TYRE SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention tire has the advantage of wearing less down the sides than regular tires, and can go on driving for a long time. It is also less likely to get stones or gravels caught in the tire, and if they do, they are less likely to damage the tire or cause a tear.

Problems solved by technology

Trailing edges of blocks in the patterns tend to wear to a greater extent than leading edges which are brought into contact with a road surface earlier than the trailing edges, to thus produce uneven wear of the blocks in the patterns.
Another problem commonly encountered by all types of tire treads is that of stone trapping.
As the tire rotates the stone or the like object rubs against the groove boundary and can cause damage.
The likelihood of damage is even greater when the stone or like object contacts the groove base since a tear can start from this location.

Method used

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  • Tire tread comprising blocks with stepped sidewalls
  • Tire tread comprising blocks with stepped sidewalls
  • Tire tread comprising blocks with stepped sidewalls

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0035]FIG. 1 shows a block 10 according to the present invention, comprising a contact face 2, two transverse faces 3 and 4, represented by one trailing face 3 and one leading face 4, and two longitudinal faces 5 and 6, represented by one right face 5 and one left face 6.

[0036]Typically, the block 10 can represent an embodiment of one block of a plurality of blocks forming an outermost row situated on the edges of the tread and forming the shoulders of the tire.

[0037]The block 10 is characterized by the presence of a step 11 formed on the leading face 4. The step 11 is delimited by an upper face 12, a front face 13, and two longitudinal faces 5a and 6a prosecuting the longitudinal faces 5 and 6 of the block 10.

[0038]In the embodiment of FIG. 1, the upper face 12 is substantially parallel to the contact face 2, both with respect to the transverse direction z, and to the longitudinal direction x.

[0039]In the embodiment of FIG. 1, the front face 13 is substantially parallel with the le...

second embodiment

[0042]FIG. 2 shows a block 20 according to the present invention, comprising a contact face 2, two transverse faces 3 and 4, represented by one trailing face 3 and one leading face 4, and two longitudinal faces 5 and 6, represented by one right face 5 and one left face 6.

[0043]Typically, the block 20 can represent an embodiment of one block of a plurality of blocks forming an outermost row situated on the edges of the tread and forming the shoulders of the tire.

[0044]The block 20 is characterized by the presence of two steps 21 and 22 formed on the leading face 4. The step 21 is delimited by an upper face 23, a front face 24, and a first portion of the two longitudinal faces 5a and 6a prosecuting the longitudinal faces 5 and 6 of the block 20. The step 22 is delimited by an upper face 25, a front face 26, and a second portion of the two longitudinal faces 5a and 6a prosecuting the longitudinal faces 5 and 6 of the block 20.

[0045]In the embodiment of FIG. 2, the upper faces 23 and 25...

third embodiment

[0050]FIG. 3 shows a block 30 according to the present invention, comprising a contact face 2, two transverse faces 3 and 4, represented by one trailing face 3 and one leading face 4, and two longitudinal faces 5 and 6, represented by one right face 5 and one left face 6.

[0051]Typically, the block 30 can represent an embodiment of one block of a plurality of blocks forming an outermost row situated on the edges of the tread and forming the shoulders of the tire.

[0052]Similarly to the block 20 of FIG. 2, the block 30 of FIG. 3 is characterized by the presence of two steps 31 and 32 formed on the leading face 4. The step 31 is delimited by an upper face 33, a front face 34, and a first portion of the two longitudinal faces 5a and 6a prosecuting the longitudinal faces 5 and 6 of the block 30. The step 32 is delimited by an upper face 35, a front face 36, and a second portion of the two longitudinal faces 5a and 6a prosecuting the longitudinal faces 5 and 6 of the block 30.

[0053]In the ...

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Abstract

A tire includes a tread band having a tread pattern defined by a plurality of grooves of substantially circumferential orientation and by a plurality of grooves of substantially transverse orientation, which grooves delimit a plurality of rubber blocks arranged in a plurality of rows of substantially circumferential orientation, each of the blocks being delimited by a contact face and at least three side faces, wherein at least some of the blocks include at least one side face of substantially transverse orientation provided with at least one irregularly shaped step having an upper face and a front face.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a national phase application based on PCT / EP2006 / 011489, filed Nov. 30, 2006, the content of which is incorporated herein by reference.FIELD OF THE INVENTION[0002]This invention concerns tire treads, especially, but not exclusively, tire treads for pneumatic tires used for heavy load automotive transport e.g. vehicles such as lorries, buses, coaches and the like. Such tires, often known generally as “truck tires”, have tread patterns which are required for all-weather type tires for travelling very long distances.BACKGROUND OF THE ART[0003]It is known to provide the treads of the tires with tread patterns formed of a plurality of blocks delimited by grooves of generally transverse and circumferential (or longitudinal) orientation. Each block of the tread pattern has a so-called leading face and a trailing face, each of which faces intersects the contact face of the block to form an edge (leading edge and trailing edge, ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B60C11/13
CPCB60C11/13B60C11/1392B60C11/1376
Inventor MINOLI, CLAUDIOMONTANARO, FABIO
Owner PIRELLI TYRE SPA